The AC fanboy in me wants to scream "YES YES A MILLION TIMES YES!" but in all honesty it depends on how obsessive you are and how you feel about certain aspects of the game. The game play is more or less the same as the others, though the controls are a bit different. Part of the fun, for me anyway, was the Fronteir and just how large it was. The hunting was pretty fun too. Really, if you weren't someone who felt a need to pre-order or get it in the first week it was out, I can see why you might wait for it to come down in price more. At the same time, if you really are that bored, I think I have a fairly insane amount of hours wrapped up into that game so it can definitely help there.
Hmm. I think I'm gonna go get it. I have drill in a couple weeks anyway so I can live with the price.